Yes it is possible but not so easy . Maybe you can read the complete post concerning TETRA on radioreference . I can do it but I have trouble with stability . I have some "samples error" with modified gnuradio grc . I asked here but I didn't get any answer .

I m waiting for the evolution of cubicsdr software and the possibility in using IQ . Still in beta test and no documentation . Requests have been made on cubicsdr web and still no answer .

the best results have been made with osmosdr-tetra_demod_fft.py (stop GUI will stabilize the way to decode)Modified grc aren't working to samples errors

If you are not familiar with osmotetra , It will be very difficult with sdrplay to succeed